Remove unused file

src/tests.webpack.js

@@ -1,8 +0,0 @@
-/**
- * This module creates a context of all the spec files (following a naming
- * convention). It's used as the webpack entry file for unit tests.
- *
- * See: https://github.com/webpack/docs/wiki/context
- */
-const context = require.context('.', true, /-test\.js$/);
-context.keys().forEach(context);